-er -ic a-a a-c a-i aaa aac aad aae aag aai aap aar ac- aca acc acd ace acg aci acp acr ad- ada adc add ade adg adi adp adr aea aec aed aee aeg aei aep aer ag- aga agc agd age agg agi agp agr ai- aia aic aid aie aig aii aip air ap- apa apc apd ape apg api app apr ar- ara arc ard are arg ari arp arr c-- caa cac cad cae cag cai cap car cca ccc ccd cce ccg cci ccp ccr cda cdc cdd cde cdg cdi cdp cdr ce- cea cec ced cee ceg cei cep cer cga cgc cgd cge cgg cgi cgp cgr ci- cia cic cid cie cig cii cip cir cpa cpc cpd cpe cpg cpi cpp cpr cra crc crd cre crg cri crp crr daa dac dad dae dag dai dap dar dca dcc dcd dce dcg dci dcp dcr dda ddc ddd dde ddg ddi ddp ddr de- dea dec ded dee deg dei dep der dga dgc dgd dge dgg dgi dgp dgr di- dia dic did die dig dii dip dir dpa dpc dpd dpe dpg dpi dpp dpr dra drc drd dre drg dri drp drr eaa eac ead eae eag eai eap ear ec- eca ecc ecd ece ecg eci ecr ed- eda edc edd ede edg edi edp edr eea eec eed eee eeg eep eer ega egc egd ege egg egi egp egr eia eic eid eie eig eii eip eir ep- epa epc epd epe epg epi epp epr era erc erd ere erg eri erp err g-d g-p gaa gac gad gae gag gai gap gar gca gcc gcd gce gcg gci gcp gcr gda gdc gdd gde gdi gdp gdr ge- gea gec ged gee geg gei gep ger gga ggc ggd ggg ggi ggp ggr gia gic gid gie gig gii gip gir gpa gpc gpd gpe gpg gpi gpp gpr gra grc grd gre grg gri grp grr i-d ia- iaa iac iad iae iag iai iap iar ica icc icd ice icg ici icp icr ida idc idd ide idg idi idp idr ie- iea iec ied iee ieg iei iep ier iga igc igd ige igg igi igp igr iia iic iid iie iii iip iir ipa ipc ipd ipe ipg ipi ipp ipr ir- ira irc ird ire irg iri irp irr p-p paa pac pad pae pag pai pap par pca pcc pcd pce pcg pci pcp pcr pda pdc pdd pde pdg pdi pdp pdr pea pec ped pee peg pei pep per pga pgc pgd pge pgg pgi pgp pgr pia pic pid pie pig pii pip pir ppa ppc ppd ppe ppg ppi ppp ppr pra prc prd pre prg pri prp prr ra- raa rac rad rae rag rai rap rar rca rcc rcd rce rcg rci rcp rcr rda rdc rdd rde rdg rdi rdp rdr re- rea rec red ree reg rei rep rer rga rgc rgd rge rgg rgi rgp rgr ria ric rid rie rig rii rip rir rpa rpc rpd rpe rpg rpi rpp rpr rra rrc rrd rrg rri rrp rrr